package com.itheima.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * 检查用户是否完成登录
 */
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {
    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();
    @Override
//    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
//        HttpServletRequest request = (HttpServletRequest) servletRequest;
//        HttpServletResponse response =(HttpServletResponse) servletResponse;
//        //1.获取本次请求的url
//        String requestURI = request.getRequestURI();
//        String[] urls = new String[]{
//                "emyloyee/login",
//                "/employee/logout",
//                "/backend/**",
//                "/front /**"
//
//        };
//
//        //2.判断本次请求是否需要处理
//        boolean check = check(urls, requestURI);
//        System.out.println(check);
//        //3.如果不需要处理，直接放行
//        if (check){
//            log.info("本地请求{}不需要处理",requestURI);
//            filterChain.doFilter(request,response);
//            return;
//
//        }
//        //4.判断登录状态，如果已登录，则直接放行
//        if(request.getSession().getAttribute("employee") != null){
//            log.info("用户已登录",request.getSession().getAttribute("employee"));
//            filterChain.doFilter(request,response);
//            return;
//        }
//        log.info("用户未登录");
//        //5.如果未登录则返回未登录结果
//        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
//
//
//        log.info("拦截到请求：{}",request.getRequestURI());
//        // 因为响应已经被发送，继续调用doFilter会导致IllegalStateException
//         //        filterChain.doFilter(request,response);
//    }
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        // 1. 获取本次请求的URL
        String requestURI = request.getRequestURI();

        // 2. 判断本次请求是否需要处理（即是否应该进行登录检查）
        boolean shouldCheckLogin = !check(new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**", // 注意：这里的路径应该是一致的，比如都是"/front/**"而不是"/front /**"
                "/common/**",
                "/user/sendMsg",  //移动端发送短信
                "user/login"  //
        }, requestURI);

        // 3. 如果不需要处理（即请求是登录、注销或特定路径下的），直接放行
        if (shouldCheckLogin == false) {
            log.info("本地请求{}不需要登录检查", requestURI);
            filterChain.doFilter(request, response);
            return;
        }

        // 4-1. 判断登录状态，如果已登录，则直接放行
        if (request.getSession().getAttribute("employee") != null) {
            log.info("用户已登录");

            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);

            filterChain.doFilter(request, response);
            return;
        }

        // 4-2. 判断登录状态，如果已登录，则直接放行
        if (request.getSession().getAttribute("user") != null) {
            log.info("用户已登录");

            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);

            filterChain.doFilter(request, response);
            return;
        }

        // 5. 如果未登录，则返回未登录结果
        log.info("用户未登录");
        response.setContentType("application/json;charset=UTF-8"); // 设置响应内容类型
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        response.getWriter().flush(); // 确保数据被写出

        // 注意：这里不再调用filterChain.doFilter(request, response);
        // 因为响应已经被发送，继续调用doFilter会导致IllegalStateException
    }



    /**
     * 路径匹配,检查本次请求是否需要放行
     * @param requestURI
     * @return
     */
    public boolean check(String[] urls,String requestURI) {
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match){
                return true;
            }

        }


        return false;
    }
}
